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Fig. 3. (Color online) The temporal change of the number of physics-related departments, whose compositions are categorized by (a) the region, (b) the college to which each department belongs, and (c) the type of university founder. The panels (a) and (d) are line graphs representing the raw data for each category, while the panels (b) and (c) indicate the cumulative number stacked on top of one another (so the outermost boundary is identical to the total number of physics-related departments, as one can readily see). In panel (d), the red curve represents the number of physics-related departments whose names composed only of natural science keywords: basic, mathematics, chemistry, biology, earth science, astronomy, and physics (the intermediate-level classification, and the blue curve represents the number of physics departments whose names do not include any other modifiers than physics (the most strict classification).
New Phys.: Sae Mulli 2024;74:610~620 https://doi.org/10.3938/NPSM.74.610
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